Semiconductor device with heat spreader

Abstract

A BGA type semiconductor device includes: a substrate having wirings and electrodes; a semiconductor element disposed on the substrate, having a rectangular plan shape, and a plurality of electrodes disposed along each side of the semiconductor element; a plurality of wires connecting the electrodes on the semiconductor element with the electrodes on the substrate; a heat dissipation member disposed on the substrate, covering the semiconductor element, and having openings formed in areas facing apex portions of the plurality of wires connected to the electrodes formed along each side of the semiconductor element; and a sealing resin member for covering and sealing the semiconductor element and heat dissipation member.

What we claim are: 
     
       1. A semiconductor device comprising:
 a substrate having wirings and connection electrodes; 
 a semiconductor element disposed above said substrate and having terminal electrodes; 
 a heat spreader disposed above said semiconductor element, and including a top plate portion and a plurality of side plate portions surrounding said top plate portion, the top plate portion including a plurality of first openings and a central area, the first openings being located outside four sides of the central area, and each of the first openings having an area larger than an area of the central area; and 
 a sealing resin member covering said semiconductor element and whole of the top plate portion; 
 wherein height of a space above an upper surface of the semiconductor element and below a lower surface of the top plate portion of the heat spreader is larger than a thickness of the semiconductor element. 
 
     
     
       2. The semiconductor device according to  claim 1 , wherein the height of the space is two times the height of the semiconductor element, or more. 
     
     
       3. The semiconductor device according to  claim 2 , wherein said first openings have trapezoid shape. 
     
     
       4. The semiconductor device according to  claim 2 , wherein number of the terminal electrodes of said semiconductor element is in a range of 200 to 1000. 
     
     
       5. The semiconductor device according to  claim 2 , wherein a thickness of said sealing resin member outside said heat spreader is thicker than or equal to 0.2 mm. 
     
     
       6. The semiconductor device according to  claim 2 , wherein a total height of said sealing resin member is lower than or equal to 1.6 mm. 
     
     
       7. The semiconductor device according to  claim 6 , wherein a total height of said heat spreader is lower than or equal to 1.4 mm. 
     
     
       8. The semiconductor device according to  claim 2 , further comprising a plurality of solder balls disposed on a bottom surface of said substrate and connected to the terminal electrodes of said semiconductor element through the connection electrodes and the wirings of the substrate. 
     
     
       9. The semiconductor device according to  claim 1 , wherein the central area of the top plate portion includes a second opening. 
     
     
       10. The semiconductor device according to  claim 1 , wherein the heat spreader has no circuit function. 
     
     
       11. The semiconductor device according to  claim 10 , wherein said heat spreader is fixed to the substrate with non-conductive adhesive.